Long-lived Paleoproterozoic granitic magmatism in the Seridó-Jaguaribe domain, Borborema Province–NE Brazil

Hollanda, Maria Helena Bezerra Maia de; Archanjo, Carlos José; Souza, Laécio Cunha de; Liu, Dunyi; Armstrong, Richard

doi:10.1016/j.jsames.2011.02.008

Cited by 80 publications

(65 citation statements)

References 26 publications

(37 reference statements)

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“…Ages ca. 2.2 Ga were also obtained by Hollanda et al (2011) and Medeiros et al (2012) at several other sites in the Rio Piranhas-Seridó terrane. In addition to the similar crystallization ages, the reported T DM values were also of the Neoarchean, and the calculated ε Nd values were only slightly more negative (between -2 and -4) than the data provided here and those by Souza et al (2007) in the region further east to the Caicó complex.…”

Section: Discussion and Geodynamic Evolutionsupporting

confidence: 70%

“…Additionally, the rocks of this complex exhibit frequent migmatization, and such a feature is absent in these orthogneisses. A Rhyacian age (U-Pb: 2,172 ± 24 Ma) was obtained by Hollanda et al (2011) in an area slightly to the east of this study region, in the city of Antonio Martins. Ages ca.…”

Section: Discussion and Geodynamic Evolutionmentioning

confidence: 99%

“…In addition to the similar crystallization ages, the reported T DM values were also of the Neoarchean, and the calculated ε Nd values were only slightly more negative (between -2 and -4) than the data provided here and those by Souza et al (2007) in the region further east to the Caicó complex. Therefore, Hollanda et al (2011) considered the Poço da Cruz Suite and the Caicó complex to be isotopically indistinguishable. Geochemical data from the Poço da Cruz Suite, and consequently, from the "G 2 " augen gneisses, remain scarce to define their formation environments.…”

Section: Discussion and Geodynamic Evolutionmentioning

confidence: 99%

“…2.0 Ga, which were interpreted as syntectonic intrusions. More recently, Hollanda et al (2011) dated these "G 2 " augen gneisses obtaining U-Pb zircon ages of approximately 2.2 Ga at various sites, with a single body in the Serra Negra region, yielding a 1.74 Ga age. Based on these results, these authors consider that these augen gneisses should belong to the magmatism inherent to the Caicó complex, an event that extended from the Rhyacian (2.24 Ga) to the Statherian period (1.75 Ga), thereby extending these conclusions to the Jaguaribeano terrane.…”

Section: Geological Frameworkmentioning

confidence: 99%

“…All of these data reliably indicate intense volcanic activity associated with the formation of volcanosedimentary sequences and intense plutonism in these areas. These ages, corresponding to the end of the Paleoproterozoic (Statherian) in the Northern portion of the province, are rare in the Rio Piranhas-Seridó terrane, and only one age has been reported in the plutonic body of Serra Negra do Norte (Hollanda et al, 2011).…”

Section: U-pb Of the Serra Do Deserto Suitementioning

confidence: 99%

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U-Pb and Sm-Nd data of the Rhyacian and Statherian Orthogneisses from Rio Piranhas-Seridó and Jaguaribeano Terranes, Borborema Province, Northeast of Brazil

Sá

Sousa

Legrand

et al. 2014

Geol. USP, Sér. cient.

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The Portalegre shear zone separates the Rio Piranhas-Seridó and the Jaguaribeano geological terranes in the Northern Domain of the Borborema Province. Banded gneisses of the Caicó and the Jaguaretama Complexes represent the basements of these terranes. U-Pb analyses yielded ages of 2,193 ± 16 Ma for the Jaguaretama Complex, which is similar to those obtained for the Caicó Complex. T DM Sm-Nd ages for these basement complexes showed Neoarchean values (ca. 2.5 Ga), with ε Nd(t) values close to the CHUR composition. Elongated bodies were found intruding into the rocks of the Jaguaretama Complex. These foliated bodies with elongated phenocrysts are described as augen gneisses of the Serra do Deserto Suite. These gneisses yielded crystallization ages of 1,777 ± 8 Ma, confirming an extensional period during the Statherian, which is well represented in the Jaguaribeano Terrane by A-type plutonic rocks. Augen gneisses with similar textures, the so called Poço da Cruz Suite, are found intruding the Caicó Complex in the Rio Piranhas-Seridó terrane; however, the ages found throughout the domain are predominantly Rhyacian (ca. 2.2 Ga) and present calc-alkaline affinities. These findings indicate that the augen gneisses, which are widely distributed in these two terranes, have different signatures and are temporally well separated. Furthermore, in agreement with previous geophysical data suggesting a division of terranes marked by the Portalegre Shear Zone, it also demonstrates that even though the Caicó and the Jaguaretama Complexes have similar ages, similar structural evolution and metamorphism under similar pressure and temperature conditions, they exhibit marked differences in composition. Keywords: Borborema Province; Jaguaribeano terrane; Rio Piranhas-Serido terrane; Serra do Deserto Suite; Poço da Cruz Suite; Portalegre shear zone. ResumoA zona de cisalhamento Portalegre separa os terrenos geológicos Rio Piranhas-Seridó e Jaguaribeano do Domínio Setentrional da Província Borborema, com gnaisses bandados dos Complexos Caicó e Jaguaretama representando os respectivos embasamentos destes terrenos. Análises U-Pb forneceram idades de 2.193 ± 16 Ma para os ortognaisses do Complexo Jaguaretama, resultados muito similares às determinadas para o Complexo Caicó. Idades T DM Sm-Nd nesses Complexos forneceram valores neoarqueanos (ca. 2,5 Ga), com ε Nd(t) muito próximos ao CHUR. Intrudindo as rochas do Complexo Jaguaretama, destacam-se corpos alongados, foliados e com pórfiros estirados, denominados de Suíte Serra do Deserto. Estes forneceram idades de cristalização a 1.777 ± 8 Ma, ratificando um período extensional que ocorreu no Estateriano, bem representado no terreno Jaguaribeano por sequências vulcanossedimentares e plutônicas Tipo-A. Augen gnaisses com texturas similares, denominados de Suíte Poço da Cruz, são encontrados intrudindo o Complexo Caicó no terreno Rio Piranhas-Seridó, porém, as idades registradas por todo este domínio são predominantemente Riacianas (ca. 2,2 Ga) e de afinidades cálcio-alcalinas, indica...

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Section: Discussion and Geodynamic Evolutionsupporting

confidence: 70%

Section: Discussion and Geodynamic Evolutionmentioning

confidence: 99%